If someone is steadfast in something that they are doing, they are convinced that what they are doing is right and they refuse to change it or to give up.
例句
He remained steadfast in his belief that he had done the right thing.他一直坚信自己做得对。
英汉词典释义
adj.
不动的;不变的
Her steadfast belief never left her for one moment.她坚定的信仰从未动摇过。
英英词典释义
Adjective
1. marked by firm determination or resolution; not shakable;
"firm convictions""a firm mouth""steadfast resolve""a man of unbendable perseverence""unwavering loyalty"
2. firm and dependable especially in loyalty;
"a steadfast ally""a staunch defender of free speech""unswerving devotion""unswerving allegiance"